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From a legal point of view, water is free. But when you bottle it, it has some value added and can be sold.
Think of selling PD books like this. Don't look so narrowly. For example; I bought a Turkish Civil Law ebook for one dolar yesterday. Laws are free to read on the internet, but turning them into ebook would have taken time, time I could have spent on studying them, especially with mid-terms this week (By the way, ebook readers are gifts of god for law students).
Everything might be an added value, even the one hour you will save.
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